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Simplified reaction mechanism of EAL showing how the 5′-deoxyadenosyl Cβ of the intrinsic coenzyme B12 can become deuterated upon (multiple) turnover of the enzyme with deuterated ethanolamine.20 Note that for simplicity, Co=C homolysis and H abstraction from the substrate to 5′-deoxyadenosyl radical are drawn here as a concerted step.
